New 6-speed gearbox designed for vintage Mopar muscle

Credit: Original article published by Classic Cars Journal.

Gen III Hemi 6-speed

Those restoring and resto-modding a vehicle with a high-horsepower Hemi engine such as the Hallcat, Hellcrate or Hellephant engines, have a new option for a 6-speed transmission designed to deal with output: American Powertrain has introduced a high-horsepower Gen III Hemi transmission package.

The Cookeville, Tennessee-based company says the new gearbox is designed for engines up to 1,100 pound-feet of torque.

“The Stage 2 upgrade takes high horsepower Tremec Magnum 6-speeds to a new level with increased torque capacity,” the company notes.

“The package includes transmission backed up with a proven DYAD dual disc clutch by Centerforce Clutches, rated for a holding capacity of 1100 lbs-ft of torque at the crank. The kit also includes a QuickTime steel scattershield bellhousing, Hydramax hydraulic conversion bearing, four quarts of transmission fluid and all the hardware needed for installation.”

The Magnum 6-speed is designed for those planning to do a Gen III engine swap into a classic Mopar muscle car, the company adds.